Bismuth ferrite-barium titanate binary high-temperature piezoelectric ceramic material as well as preparation method and application thereof

A high-temperature piezoelectric and ceramic material technology, applied in the field of high-temperature piezoelectric materials, can solve problems such as low piezoelectric performance, large dielectric loss, and limited applications

Active Publication Date: 2021-08-24
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

BF-BT ceramics are similar to lead-based piezoelectric ceramic systems, and have excellent piezoelectric and ferroelectric properties when the components are located near the quasi-isomorphic phase boundary (MPB), but due to the presence of Bi in BF-BT ceramics during sintering 2 o 3 volatilization and Fe 3+ Phenomena such as the price change of ceramic samples lead to problems such as high defect ion concentration, high dielectric loss tanδ, and low piezoelectric properties, which greatly limit its application in piezoelectric devices.

Method used

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  • Bismuth ferrite-barium titanate binary high-temperature piezoelectric ceramic material as well as preparation method and application thereof
  • Bismuth ferrite-barium titanate binary high-temperature piezoelectric ceramic material as well as preparation method and application thereof
  • Bismuth ferrite-barium titanate binary high-temperature piezoelectric ceramic material as well as preparation method and application thereof

Examples

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Effect test

preparation example Construction

[0022] The invention provides a method for preparing a bismuth ferrite-barium titanate binary high-temperature piezoelectric ceramic material, comprising the following steps:

[0023] Mix the bismuth ferrite-barium titanate powder with the first ball milling medium, and perform the first ball milling to obtain bismuth ferrite-barium titanate coarse powder, the particle size of the bismuth ferrite-barium titanate coarse powder is 800nm~ 1.5μm;

[0024] Mix the bismuth ferrite-barium titanate powder with the second ball milling medium, and perform the second ball milling to obtain bismuth ferrite-barium titanate fine powder, the particle size of the bismuth ferrite-barium titanate fine powder is 100~ 800nm;

[0025] Mixing the bismuth ferrite-barium titanate coarse powder and bismuth ferrite-barium titanate fine powder to obtain a mixed powder; mixing the mixed powder with a binder, followed by granulation and isostatic pressing , debinding and sintering to obtain bismuth ferr...

Embodiment 1

[0055] According to chemical composition (1-x)BiFeO 3 -xBaTiO 3 , x=0.25, the analytically pure Bi 2 o 3 , Fe 2 o 3 、TiO 2 、BaCO 3 and MnO 2 According to the required stoichiometric ratio, 30 g of the above-mentioned raw materials were weighed and put into a ball mill jar. Under the condition of the ball milling speed of 250 r / min, 30 mL of deionized water and 90 g of zirconia balls with a diameter of 5 mm were added for ball milling for 6 hours. The final slurry was poured into a ceramic bowl for drying, passed through a 120-mesh screen, put it into a crucible, raised the temperature to 750 °C at a heating rate of 5 °C / min, and calcined for 4 hours. The obtained material was passed through a 120-mesh screen, and the obtained The material repeats the above steps to perform ball milling, calcination and ball milling in turn to obtain 0.75BiFeO 3 -0.25BaTiO 3 Synthetic powder;

[0056] Add 15mL of absolute ethanol, 15g of the 0.75BiFeO 3 -0.25BaTiO 3 The synthetic po...

Embodiment 2

[0061] The difference from Example 1 is only: x=0.30, and the others are the same as Example 1, which is recorded as 0.70BF-0.30BT.

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Abstract

The invention provides a bismuth ferrite-barium titanate binary high-temperature piezoelectric ceramic material as well as a preparation method and application thereof, which belongs to the technical field of high-temperature piezoelectric materials. According to the method, the bismuth ferrite-barium titanate coarse powder and the bismuth ferrite-barium titanate fine powder with the particle size difference of 700 nm-1.2 mum are used as raw materials, the bismuth ferrite-barium titanate is prepared by using the mixed powder with different particle sizes, and due to the fact that the surface tension of large particles and small particles is larger than that of the same particles when the large particles and the small particles are in contact, growth of crystal grains is better facilitated, the relative density of the ceramic material is increased, the porosity is reduced, the dielectric constant and piezoelectric coefficient of the ceramic material are further improved, the dielectric property is improved, the dielectric loss tandelta is reduced, the insulating property of the ceramic is improved, the leakage current is reduced, and the ceramic material has excellent piezoelectric property. The result of the embodiment shows that the piezoelectric constant of the bismuth ferrite-barium titanate binary high-temperature piezoelectric ceramic material prepared by the preparation method disclosed by the invention reaches 200 pC/N.

Description

technical field [0001] The invention relates to the technical field of high-temperature piezoelectric materials, in particular to a bismuth ferrite-barium titanate binary high-temperature piezoelectric ceramic material and a preparation method and application thereof. Background technique [0002] The main research systems in high temperature piezoelectric materials are Pb(Zr x Ti 1-x )O 3 (x=0.52) represents lead-based piezoelectric ceramics, niobate-based lead-free piezoelectric ceramics, and various bismuth layered structures. Among them, lead zirconate titanate PZT ceramics is the most mature in the research of all piezoelectric ceramics, and it is also the most widely used in practice. However, one disadvantage of PZT piezoelectric ceramics is that the Curie temperature Tc is generally less than 400°C, which limits its application in high temperature fields. At the same time, lead-based materials will pollute the environment during production, use and disposal, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/26C04B35/468C04B35/622
CPCC04B35/26C04B35/4682C04B35/622C04B2235/3236C04B2235/3215C04B2235/3298C04B2235/5436C04B2235/5445C04B2235/6562C04B2235/6567C04B2235/77C04B2235/96
Inventor 陈建国仝宾宾程晋荣沈昕
Owner SHANGHAI UNIV
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